Punch-press.



PATENTED SEPT. 26, 1905.

No. 800,214. I

A. JOHNSTON. PUNCH PRESS.

APPLIGATION FILED APR.17.1905.

2 HEETS-SHEET 1.

' PATBNTBD SEPT. 26, 1905.

A. JOHNSTON.

- PUNCH PRESS APJPLIOATIOII 11121) 11.111905.

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' l\ w n. IN v trio, while the punch is prevented from per-' forming its usual function except at predev specification.

ALLEN JOHNSTON, OF OTTUMWA, IOWA.

PUNCH-PRESS.

Specification of Letters Patent.

Patented Sept. 26, 1905.

Application filed April 17, 1905- Serial N0. 255,918.

ToalZ whom it may concern:

Be it known that I, ALLEN J oHNsToN, a citizen of the United States, residing in Ottumwa, in the county of Wapello and State of Iowa, have invented a new and useful Improvement in Punch-Presses, of which the following is a This invention is an improvement in punchpresses, and my object therein has been to provide aconstruction permitting a rapid and continuous movement of the actuating'eccentermined intervals. These intervals may be greater or less, as desiredas, for instance, the punch may be permitted to operate at every second revolution only of the eccentric, or at every third revolution only, or at every fourth revolution only. I accomplish this result by disconnecting the sliding punchholder from its operating eccentric periodically and maintaining the disconnection during the desired interval of non-action, and this is preferably done in the manner hereinafter set forth.

- A further object of the invention is to so construct the press as to allow the flywheel or wheels and the crank-shaft to run at a comparatively high speed, while the shaft which blows or jars incident to starting heavyintermittently-moving parts.

As heretofore constructed the crank-shaft, the pitman, and the slide or punch holder have rested between strokes, while by my invention the crankshaft and pitman move continuously, leaving only the slide to rest between the strokes. By this feature the momentum of the continuously-moving parts is maintained, and they are thus adapted to impart at all times their full power. The second shaft travels much slower, and the clutch-cam is on this shaft.

These and other features of the invention are fully set forth in the accompanying description and illustrated in the drawings.

In the accompanying drawings, Figure l is a plan of my improved press. Fig. 2 is a horizontal section thereof. Fig. 3 is a section onthe line 3 3 of Fig. 1, and Fig. 4 is a section on the line 4 4 of Fig. 3. Fig. 5 is a section on the line 5 5 of Fig. 3.

In said drawings, 5 represents the frame of the machine, and 6 is the main shaft, jour naled in bearings 7 7 in the frame and driven by the pulley 8. The usual balanced fly- .wheels 9 9 are located outside the bearings and. on opposite ends of the shaft. center of the shaft is .an eccentric or crank At the portion 10, surrounding which is a brass sleeve 30, also preferably made eccentric, and

and screws 13, this construction uniting the pitman to the eccentric in such manner as to cause a reciprocating actuation of the pitman 11 at each revolution of the eccentric.

Inthe pitman 11 is formed a recess adapted to receive the wedge 14, and below this recess are two horizontal projections 15 15, forming a fork in which the removable extension or connecting-piece 16 is inserted and confined by a front cap or bridge piece 17 and bolts 18, entering the projections 15.- This connecting-piece is enlarged at both ends, as plainly shown at Fig. 4., so that it is adapted to unite the .pitman to the slide or holder 19, in or to which the punch is secured, and to communicate motion to the latter in both directions, both the pitman and the slide having recesses shaped to correspond to the en- 'in slide or holder 19, which is entered by the connecting-piece, is open upon the front side, so as to permit the connecting-piece to move into and out of the recess, and this feature allows the breaking of the union between the pitman and the slide at any desired interval by simply swinging the pitman and the connecting-piece on the eccentric in such way as' to carry the piece out of the recess. For thus swinging the pitman any suitable means may be employed, and I have illustrated a very simple form of such means in the drawings. An auxiliary shaft is shown at 22 and actuated from the main shaft by gears 23 and 24, the gears being proportioned to drive the auxiliary shaft at a slow speed as compared with the speed of the main shaft. As shown, the

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at Fig. 3,) and this cam operates a lever 26, pivoted stationarily at 27 at the desired intervals. The lower end of the lever is brought in contact with the lower end of the connecting-piece by the cam, so that the lever swings the connecting-piece 16 out of the recess in the slide 19, thus destroying the operative connection between the two and rendering the punch idle until the operative relation is restored. The cam is adapted to maintain the disconnected condition through three or any desired number of revolutions of the main shaft. A spring 28, joined to the pitman 11 and the lever, is adapted to draw the connecting-piece back to its operative position in the sliding head whenever the cam allows the lever to drop into its depressed surface. When the connecting piece is forced out of operation, as described, it rides idly up and down on the end of the lever. The slide is provided with two forwardly-projecting lugs 50 50 so located that the enlargements or lateral lugs 51 51 at the bottom of the connecting-piece 16 will move under them when the piece 16 is forced out of its operative position in the slide, as above set forth. By this construction the slide is with certainty caused to be in proper position for reengagement with the connecting-piece whenever that takes place, both the of wheel 24: which contacts with the end of the cam 25 is formed a circular groove 33, and in this groove is located a pin 34, forming a stop. The cam carries a sliding bolt or latch 35 which is located opposite to and adapted to enter the groove 33 and is provided with a spring 36, acting to press it toward the groove. hen allowed to enter the groove, the pin 34 engages the latch and compels the cam to move with the wheel. The latch is controlled by a key 37, which when the cam is at rest lies in the path of the lug 38 on the latch, but which can be withdrawn at will by the operator through the medium of a rod 39, attached to a foot-treadle, (not shown,) or operated in some other convenient way. This key may be returned to its normal position as soon as the turning movement of the cam has carried the latch beyond it, and the cam is grooved exteriorly, as at 40, to permit this, and the latch may be forced back to its normal position by the key,

which is desirably made wedge-shaped for the purpose.

The operation of the invention is fully set forth above, and by it I obtain in a very simple way the desired intervals between the operations of the punch without slowing the speed of the actuating devices or that of the punch when it operates.

The connecting-piece 16 is readily removable and may be replaced whenever necessary.

I claim* 1. The combination in a punch-press, of a rapidly-revolving drive-shaft, the slide, a reciprocating device actuated by the drive-shaft and serving in turn to actuate the slide, such device being adapted to be disconnected from the slide, an auxiliary shaft having a slow speed, and means actuated'by said auxiliary shaft for causing the disconnection at desired intervals.

2. The combination in a punch-press, of a rapidly-revolving drive-shaft, the slide, a reciprocating device actuated by the drive-shaft and serving in turn to actuate the slide, such device being adapted to be disconnected from the slide, an auxiliary shaft having a slow speed, a cam upon said shaft and a device operated by the cam and acting to cause thedisconnection at desired inter ads.

3. The combination in a punch-press, of a rapidly-revolving drive-shaft, the punchholder, a reciprocating device actuated by the drive-shaft and serving in turn to actuate the punch-holder, such device being adapted to be disconnected from the punch-holder, an auxiliary shaft having a slow speed, a cam upon said shaft, and a lever operated by the cam and acting to cause the disconnection at desired intervals.

4. In a power-press, a crank-shaft, a slide havinga recess, a pitman connected to said shaft, a secondary shaft geared to said crankshaft and timed to run a less number of revolutions and having a cam acting to move the pitman out of the recess in the slide.

5. In a power-press, a crank-shaft adapted to run continuously, a secondary shaft adapted to run intermittently, a. slide having a recess, a pitman connecting at one end with the crank and adapted to enter said recess, and means on the secondary shaft through which the pitman is disengaged from said recess.

ALLEN JOHNSTON.

WVitnesses:

Geo. F. HALL, F. W. SHARP. 

